Part A Which of the following statements about pain-relief substances is correct? View Available Hint(s) O Endorphins are synthetic pain-killers. O Met-enkephalin has pain-killing ability because of...

Extracted text: Part A Which of the following statements about pain-relief substances is correct? View Available Hint(s) O Endorphins are synthetic pain-killers. O Met-enkephalin has pain-killing ability because of its structural similarity to morphine. O Many natural pain-killing polypeptides are ideal for medical use. O Receptors of opium derivatives are found in all body cells. Submit